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11/22/2017 10:05:29 PM
Posted: 10/13/2004 10:57:59 AM EST
Link Posted: 10/13/2004 11:07:49 AM EST
Depends on which pin you mean.
Link Posted: 10/13/2004 11:08:29 AM EST
Link Posted: 10/13/2004 11:09:19 AM EST
Yes, you're correct. "Small hole receivers of .250" are the "milspec", but during early production by Colt for the civilian market, they produced rifles utilizing a .315" spec, so as to preclude use of military uppers on civilian lowers. This production lasted until roughly 1993-1994. As a general rule of thumb all Colt "unblocked" lower receivers, are large hole, while pre-ban "blocked" lower receivers represent transition years where occasional variations popped up.
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